使用弯道谐振器的紧凑型多模UWB微带滤波器设计

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"这篇研究论文介绍了一种利用改良的均方谐振器设计的紧凑型多模UWB微带滤波器。通过采用这种新型谐振器，可以在超宽带（UWB）频率范围内实现具有六个传输极点的滤波器。滤波器的通带范围从1.8GHz到4.7GHz，模拟回波损耗在通带内优于220dB，实测值则优于219dB。中心频率处的插入损耗约为0.38dB。此外，论文还探讨了调整这种新型UWB滤波器带宽的方法。该研究由Wiley Periodicals, Inc.于2016年发表在 Microwave Opt Technol Lett 杂志上。" 本文的核心知识点包括： 1. **超宽带（UWB）微带滤波器**：UWB技术主要用于无线通信，因其具有低功率、高分辨率和抗多径衰落等优点而备受关注。微带滤波器是UWB系统中的关键组件，用于选择性地让特定频率范围的信号通过，从而抑制不必要的干扰和噪声。 2. **均方谐振器**：传统微带谐振器经过改良，形成均方谐振器，其结构简单但适用于构建UWB滤波器。谐振器是滤波器的基本构造单元，通过改变谐振器的尺寸和形状，可以调整其谐振频率和带宽特性。 3. **多模谐振器（MMR）**：多模谐振器能够在单个结构中支持多个谐振模式，这使得在有限的空间内实现多个传输极点成为可能。文章中，仅使用两个谐振器就实现了六极点的UWB滤波器，显著提高了空间效率。 4. **滤波器性能**：该滤波器在1.8GHz至4.7GHz的频率范围内具有平坦的幅频响应，良好的回波损耗（优于220dB的模拟值，实测超过219dB），表明其有很高的选择性和抑制非通带信号的能力。中心频率处的插入损耗仅为0.38dB，这意味着在该频率时，滤波器对信号的影响很小。 5. **带宽调整方法**：论文还讨论了如何调整这种新型滤波器的带宽，这是设计灵活且适应不同应用需求的关键。通过对谐振器参数的微调，可以实现更窄或更宽的通带，以满足特定通信系统的规格要求。 6. **实验验证**：除了理论分析，文章还包括了实测数据，这证明了设计的有效性和实际应用潜力。测量结果与模拟结果的吻合度，进一步确认了该滤波器设计的可靠性和准确性。这篇论文为UWB通信系统提供了新的滤波器设计方案，利用均方谐振器实现紧凑型多模滤波器，并探讨了带宽调整策略，对于微带滤波器设计领域具有重要的理论和实践价值。

COMPACT MULTI-MODE UWB

MICROSTRIP FILTER USING MEANDER

RESONATOR

Tianliang Zhang, Liguo Zhou, Kai Yang, Wei Dang,

Kezhao Hua, Changlin Yang, and Peng Chen

School of Aeronautics and Astronautics, University of Electronic

Science and Technology of China, Chengdu 611731, China;

Corresponding author: ztl@uestc.edu.cn

Received 31 December 2015

ABSTRACT: In this paper, traditional microstrip resonator is mean-

dered to construct a compact multi-mode resonator (MMR). The mean-

der resonator is very simple but convenient for ultra-wide band (UWB)

passband filter. And then, a UWB microstrip filter with six transmission

poles in the passband is achieved by using only two resonators. The fil-

ter has an amplitude frequency response with a passband from 1.8 GHz

to 4.7 GHz, the simulated return loss in passband is better than 220dB,

and the measured one is better than 219dB. The tested insertion loss at

center frequency is about 0.38 dB. Methods of adjusting the bandwidth

of this new kind of UWB filter is also discussed in this paper.

2016

Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2026–2029,

2016; View this article online at wileyonlinelibrary.com. DOI 10.1002/

mop.29957

Key words: microstrip filter; ultra-wide band; multi-mode resonator;

compact resonator

1. INTRODUCTION

With the rapid development of wireless communication technol-

ogy and wireless multimedia services, ultra-wide band (UWB)

technology has attracted more and more attention from the

researchers. Multi-mode resonator (MMR) method [1–9] is one

of important methods for UWB band-pass filters (BPFs). The

MMR method mainly uses multiple resonant modes distributed

evenly over the entire UWB. In Ref. [1], a MMR with step-

impedance resonators (SIR) is originally presented to construct a

UWB filter. The MMR consists of one half-wavelength (k/2)

low-impedance line section in the center and two identical k/4

high-impedance line sections at the two sides. Up to now, there

are many works having been done following the lecture [1]. For

instance, [6] employed short-circuited stubs at the input/output

to improve the selectivity and out-of-band characteristics of the

UWB filter [7]. designed a two-stage SIR-type UWB filter after

modifying the structure of low-impedance line [8] used a shunt

short-circuited stub at the center of a half-wavelength resonator

to improve the out-of-band rejection [9]. bended low-impedance

line section of the resonator to reduce the horizontal circuit size

of the filter, and added a folded stepped-impedance stub to the

center transmission line of the MMR to improve the selectivity

[10] and [11] transformed the structure of the SIR to design

multi-band bandpass filter by embedding short-circuit stubs or

loading open-stub line [12]. designed a bandpass filter with high

selectivity and a wide stopband by optimizing the parameters of

Ref. [11] to change the resonant frequencies of the even modes.

From the references mentioned above, it can be known that

the harmonic resonant frequencies of MMR can be adjusted to

targeted points mainly through adjusting the perturbations which

are added to traditional half-wavelength resonator. In this paper,

traditional microstrip resonator is simply meandered to construct

compact MMR, and then changes the internal field distribution

to change the harmonic frequencies of the resonator mainly

through changing the internal structure parameter of resonators,

without using SIR structure or any additional perturbations. Fur-

thermore, the relative position of the fundamental passband and

the harmonic passbands, the distribution of the transmission

poles in each above passband can be simultaneously adjusted.

When the fundamental passband and the harmonic passbands

are completely overlapped, UWB filter can be achieved. As an

example, in this paper, two similar resonators are used to con-

struct a second-order UWB filter with six transmission poles in

the passband. This method also has: fewer challenges in design,

simpler structure; the microstrip line width of all sections of the

resonator can be same totally or be different as SIR; and good

return loss in passband can be achieved for a UWB filter.

2. A COMPACT MICROSTIP RESONATOR

In this paper, a meander resonator structure is proposed and

shown in Figure 1(a). According to the reference [13,14], as

shown in Figure 1(b), the coupling between two resonators is

pure electric coupling. It is easy to achieve strong coupling

between the resonators, which will make for designing broad-

band filters. After the resonator twists and turns, it is also bene-

ficial to the miniaturization of the filter.

In Figure 1(a), all the initial size parameters are set as fol-

lows: w

5 0.27 mm, g

5 0.60 mm, g

5 0.60 mm,

Figure 1 The compact resonator and the coupling between resonators. (a) compact resonator. (b) strong electric coupling. (c) coupling resonators

tapped with input and output

2026 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol. 58, No. 8, August 2016 DOI 10.1002/mop

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